I question whether publicly posting these discoveries on a blog is in line with the hacker ethic. I have figured out how to open doors before, but I didn't use it for personal gain or feel the need to brag about it.
Part of the "hacker ethic" includes the notion that information should be free. How you use that information is another matter.
If it were commonly known that this default code existed it's less likely that those who are responsible for setting up these keypads would leave the default set.
Those wishing to exploit it are the ones who actively seek out this sort of information.
